72533730 has 32 divisors (see below), whose sum is σ = 184322304. Its totient is φ = 18204416.

The previous prime is 72533711. The next prime is 72533753. The reversal of 72533730 is 3733527.

It is a super-2 number, since 2×72533730² = 10522283975425800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70602 + ... + 71621.

It is an arithmetic number, because the mean of its divisors is an integer number (5760072).

Almost surely, 2^72533730 is an apocalyptic number.

72533730 is an abundant number, since it is smaller than the sum of its proper divisors (111788574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72533730 is a wasteful number, since it uses less digits than its factorization.

72533730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142250.

The product of its (nonzero) digits is 13230, while the sum is 30.

The square root of 72533730 is about 8516.6736464420. The cubic root of 72533730 is about 417.0422008139.

The spelling of 72533730 in words is "seventy-two million, five hundred thirty-three thousand, seven hundred thirty".